3 * Copyright (c) 2000, 2001, 2002 Fabrice Bellard
5 * This file is part of FFmpeg.
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
26 #if CONFIG_VOBSUB_DEMUXER
27 # include "subtitles.h"
28 # include "libavutil/bprint.h"
33 #include "libavutil/avassert.h"
35 /*********************************************/
38 #define MAX_SYNC_SIZE 100000
40 static int check_pes(const uint8_t *p, const uint8_t *end)
43 int pes2 = (p[3] & 0xC0) == 0x80 &&
44 (p[4] & 0xC0) != 0x40 &&
45 ((p[4] & 0xC0) == 0x00 ||
46 (p[4] & 0xC0) >> 2 == (p[6] & 0xF0));
48 for (p += 3; p < end && *p == 0xFF; p++) ;
49 if ((*p & 0xC0) == 0x40)
52 if ((*p & 0xF0) == 0x20)
53 pes1 = p[0] & p[2] & p[4] & 1;
54 else if ((*p & 0xF0) == 0x30)
55 pes1 = p[0] & p[2] & p[4] & p[5] & p[7] & p[9] & 1;
62 static int check_pack_header(const uint8_t *buf)
64 return (buf[1] & 0xC0) == 0x40 || (buf[1] & 0xF0) == 0x20;
67 static int mpegps_probe(AVProbeData *p)
71 int sys = 0, pspack = 0, priv1 = 0, vid = 0;
72 int audio = 0, invalid = 0, score = 0;
75 for (i = 0; i < p->buf_size; i++) {
76 code = (code << 8) + p->buf[i];
77 if ((code & 0xffffff00) == 0x100) {
78 int len = p->buf[i + 1] << 8 | p->buf[i + 2];
79 int pes = endpes <= i && check_pes(p->buf + i, p->buf + p->buf_size);
80 int pack = check_pack_header(p->buf + i);
82 if (code == SYSTEM_HEADER_START_CODE)
84 else if (code == PACK_START_CODE && pack)
86 else if ((code & 0xf0) == VIDEO_ID && pes) {
90 // skip pes payload to avoid start code emulation for private
92 else if ((code & 0xe0) == AUDIO_ID && pes) {audio++; i+=len;}
93 else if (code == PRIVATE_STREAM_1 && pes) {priv1++; i+=len;}
94 else if (code == 0x1fd && pes) vid++; //VC1
96 else if ((code & 0xf0) == VIDEO_ID && !pes) invalid++;
97 else if ((code & 0xe0) == AUDIO_ID && !pes) invalid++;
98 else if (code == PRIVATE_STREAM_1 && !pes) invalid++;
102 if (vid + audio > invalid + 1) /* invalid VDR files nd short PES streams */
103 score = AVPROBE_SCORE_EXTENSION / 2;
105 // av_log(NULL, AV_LOG_ERROR, "vid:%d aud:%d sys:%d pspack:%d invalid:%d size:%d \n",
106 // vid, audio, sys, pspack, invalid, p->buf_size);
108 if (sys > invalid && sys * 9 <= pspack * 10)
109 return (audio > 12 || vid > 3 || pspack > 2) ? AVPROBE_SCORE_EXTENSION + 2
110 : AVPROBE_SCORE_EXTENSION / 2 + 1; // 1 more than mp3
111 if (pspack > invalid && (priv1 + vid + audio) * 10 >= pspack * 9)
112 return pspack > 2 ? AVPROBE_SCORE_EXTENSION + 2
113 : AVPROBE_SCORE_EXTENSION / 2; // 1 more than .mpg
114 if ((!!vid ^ !!audio) && (audio > 4 || vid > 1) && !sys &&
115 !pspack && p->buf_size > 2048 && vid + audio > invalid) /* PES stream */
116 return (audio > 12 || vid > 3 + 2 * invalid) ? AVPROBE_SCORE_EXTENSION + 2
117 : AVPROBE_SCORE_EXTENSION / 2;
119 // 02-Penguin.flac has sys:0 priv1:0 pspack:0 vid:0 audio:1
120 // mp3_misidentified_2.mp3 has sys:0 priv1:0 pspack:0 vid:0 audio:6
121 // Have\ Yourself\ a\ Merry\ Little\ Christmas.mp3 0 0 0 5 0 1 len:21618
125 typedef struct MpegDemuxContext {
126 int32_t header_state;
127 unsigned char psm_es_type[256];
131 #if CONFIG_VOBSUB_DEMUXER
132 AVFormatContext *sub_ctx;
133 FFDemuxSubtitlesQueue q[32];
137 static int mpegps_read_header(AVFormatContext *s)
139 MpegDemuxContext *m = s->priv_data;
141 int64_t last_pos = avio_tell(s->pb);
143 m->header_state = 0xff;
144 s->ctx_flags |= AVFMTCTX_NOHEADER;
146 avio_get_str(s->pb, 6, buffer, sizeof(buffer));
147 if (!memcmp("IMKH", buffer, 4)) {
149 } else if (!memcmp("Sofdec", buffer, 6)) {
152 avio_seek(s->pb, last_pos, SEEK_SET);
154 /* no need to do more */
158 static int64_t get_pts(AVIOContext *pb, int c)
162 buf[0] = c < 0 ? avio_r8(pb) : c;
163 avio_read(pb, buf + 1, 4);
165 return ff_parse_pes_pts(buf);
168 static int find_next_start_code(AVIOContext *pb, int *size_ptr,
169 int32_t *header_state)
171 unsigned int state, v;
174 state = *header_state;
181 if (state == 0x000001) {
182 state = ((state << 8) | v) & 0xffffff;
186 state = ((state << 8) | v) & 0xffffff;
191 *header_state = state;
197 * Extract stream types from a program stream map
198 * According to ISO/IEC 13818-1 ('MPEG-2 Systems') table 2-35
200 * @return number of bytes occupied by PSM in the bitstream
202 static long mpegps_psm_parse(MpegDemuxContext *m, AVIOContext *pb)
204 int psm_length, ps_info_length, es_map_length;
206 psm_length = avio_rb16(pb);
209 ps_info_length = avio_rb16(pb);
211 /* skip program_stream_info */
212 avio_skip(pb, ps_info_length);
213 /*es_map_length = */avio_rb16(pb);
214 /* Ignore es_map_length, trust psm_length */
215 es_map_length = psm_length - ps_info_length - 10;
217 /* at least one es available? */
218 while (es_map_length >= 4) {
219 unsigned char type = avio_r8(pb);
220 unsigned char es_id = avio_r8(pb);
221 uint16_t es_info_length = avio_rb16(pb);
223 /* remember mapping from stream id to stream type */
224 m->psm_es_type[es_id] = type;
225 /* skip program_stream_info */
226 avio_skip(pb, es_info_length);
227 es_map_length -= 4 + es_info_length;
229 avio_rb32(pb); /* crc32 */
230 return 2 + psm_length;
233 /* read the next PES header. Return its position in ppos
234 * (if not NULL), and its start code, pts and dts.
236 static int mpegps_read_pes_header(AVFormatContext *s,
237 int64_t *ppos, int *pstart_code,
238 int64_t *ppts, int64_t *pdts)
240 MpegDemuxContext *m = s->priv_data;
241 int len, size, startcode, c, flags, header_len;
242 int pes_ext, ext2_len, id_ext, skip;
244 int64_t last_sync = avio_tell(s->pb);
247 avio_seek(s->pb, last_sync, SEEK_SET);
249 /* next start code (should be immediately after) */
250 m->header_state = 0xff;
251 size = MAX_SYNC_SIZE;
252 startcode = find_next_start_code(s->pb, &size, &m->header_state);
253 last_sync = avio_tell(s->pb);
255 if (avio_feof(s->pb))
257 // FIXME we should remember header_state
258 return AVERROR(EAGAIN);
261 if (startcode == PACK_START_CODE)
263 if (startcode == SYSTEM_HEADER_START_CODE)
265 if (startcode == PADDING_STREAM) {
266 avio_skip(s->pb, avio_rb16(s->pb));
269 if (startcode == PRIVATE_STREAM_2) {
271 /* Need to detect whether this from a DVD or a 'Sofdec' stream */
272 int len = avio_rb16(s->pb);
274 uint8_t *ps2buf = av_malloc(len);
277 bytesread = avio_read(s->pb, ps2buf, len);
279 if (bytesread != len) {
280 avio_skip(s->pb, len - bytesread);
284 p = memchr(ps2buf, 'S', len - 5);
287 m->sofdec = !memcmp(p+1, "ofdec", 5);
289 m->sofdec -= !m->sofdec;
292 if (len == 980 && ps2buf[0] == 0) {
294 uint32_t startpts = AV_RB32(ps2buf + 0x0d);
295 uint32_t endpts = AV_RB32(ps2buf + 0x11);
296 uint8_t hours = ((ps2buf[0x19] >> 4) * 10) + (ps2buf[0x19] & 0x0f);
297 uint8_t mins = ((ps2buf[0x1a] >> 4) * 10) + (ps2buf[0x1a] & 0x0f);
298 uint8_t secs = ((ps2buf[0x1b] >> 4) * 10) + (ps2buf[0x1b] & 0x0f);
300 m->dvd = (hours <= 23 &&
303 (ps2buf[0x19] & 0x0f) < 10 &&
304 (ps2buf[0x1a] & 0x0f) < 10 &&
305 (ps2buf[0x1b] & 0x0f) < 10 &&
307 } else if (len == 1018 && ps2buf[0] == 1) {
309 uint8_t hours = ((ps2buf[0x1d] >> 4) * 10) + (ps2buf[0x1d] & 0x0f);
310 uint8_t mins = ((ps2buf[0x1e] >> 4) * 10) + (ps2buf[0x1e] & 0x0f);
311 uint8_t secs = ((ps2buf[0x1f] >> 4) * 10) + (ps2buf[0x1f] & 0x0f);
313 m->dvd = (hours <= 23 &&
316 (ps2buf[0x1d] & 0x0f) < 10 &&
317 (ps2buf[0x1e] & 0x0f) < 10 &&
318 (ps2buf[0x1f] & 0x0f) < 10);
325 /* If this isn't a DVD packet or no memory
326 * could be allocated, just ignore it.
327 * If we did, move back to the start of the
328 * packet (plus 'length' field) */
329 if (!m->dvd || avio_skip(s->pb, -(len + 2)) < 0) {
331 * This packet will be lost but that can't be helped
332 * if we can't skip back
338 avio_skip(s->pb, len);
341 } else if (!m->dvd) {
342 int len = avio_rb16(s->pb);
343 avio_skip(s->pb, len);
347 if (startcode == PROGRAM_STREAM_MAP) {
348 mpegps_psm_parse(m, s->pb);
352 /* find matching stream */
353 if (!((startcode >= 0x1c0 && startcode <= 0x1df) ||
354 (startcode >= 0x1e0 && startcode <= 0x1ef) ||
355 (startcode == 0x1bd) ||
356 (startcode == PRIVATE_STREAM_2) ||
357 (startcode == 0x1fd)))
360 *ppos = avio_tell(s->pb) - 4;
362 len = avio_rb16(s->pb);
364 dts = AV_NOPTS_VALUE;
365 if (startcode != PRIVATE_STREAM_2)
373 /* XXX: for mpeg1, should test only bit 7 */
377 if ((c & 0xc0) == 0x40) {
378 /* buffer scale & size */
383 if ((c & 0xe0) == 0x20) {
385 pts = get_pts(s->pb, c);
388 dts = get_pts(s->pb, -1);
391 } else if ((c & 0xc0) == 0x80) {
393 flags = avio_r8(s->pb);
394 header_len = avio_r8(s->pb);
396 if (header_len > len)
400 dts = pts = get_pts(s->pb, -1);
403 dts = get_pts(s->pb, -1);
407 if (flags & 0x3f && header_len == 0) {
409 av_log(s, AV_LOG_WARNING, "Further flags set but no bytes left\n");
411 if (flags & 0x01) { /* PES extension */
412 pes_ext = avio_r8(s->pb);
414 /* Skip PES private data, program packet sequence counter
415 * and P-STD buffer */
416 skip = (pes_ext >> 4) & 0xb;
418 if (pes_ext & 0x40 || skip > header_len) {
419 av_log(s, AV_LOG_WARNING, "pes_ext %X is invalid\n", pes_ext);
422 avio_skip(s->pb, skip);
425 if (pes_ext & 0x01) { /* PES extension 2 */
426 ext2_len = avio_r8(s->pb);
428 if ((ext2_len & 0x7f) > 0) {
429 id_ext = avio_r8(s->pb);
430 if ((id_ext & 0x80) == 0)
431 startcode = ((startcode & 0xff) << 8) | id_ext;
438 avio_skip(s->pb, header_len);
443 if (startcode == PRIVATE_STREAM_1) {
444 startcode = avio_r8(s->pb);
449 if (dts != AV_NOPTS_VALUE && ppos) {
451 for (i = 0; i < s->nb_streams; i++) {
452 if (startcode == s->streams[i]->id &&
453 s->pb->seekable /* index useless on streams anyway */) {
454 ff_reduce_index(s, i);
455 av_add_index_entry(s->streams[i], *ppos, dts, 0, 0,
456 AVINDEX_KEYFRAME /* FIXME keyframe? */);
461 *pstart_code = startcode;
467 static int mpegps_read_packet(AVFormatContext *s,
470 MpegDemuxContext *m = s->priv_data;
472 int len, startcode, i, es_type, ret;
473 int lpcm_header_len = -1; //Init to suppress warning
474 int request_probe= 0;
475 enum AVCodecID codec_id = AV_CODEC_ID_NONE;
476 enum AVMediaType type;
477 int64_t pts, dts, dummy_pos; // dummy_pos is needed for the index building to work
480 len = mpegps_read_pes_header(s, &dummy_pos, &startcode, &pts, &dts);
484 if (startcode >= 0x80 && startcode <= 0xcf) {
488 /* audio: skip header */
490 lpcm_header_len = avio_rb16(s->pb);
492 if (startcode >= 0xb0 && startcode <= 0xbf) {
493 /* MLP/TrueHD audio has a 4-byte header */
499 /* now find stream */
500 for (i = 0; i < s->nb_streams; i++) {
502 if (st->id == startcode)
506 es_type = m->psm_es_type[startcode & 0xff];
507 if (es_type == STREAM_TYPE_VIDEO_MPEG1) {
508 codec_id = AV_CODEC_ID_MPEG2VIDEO;
509 type = AVMEDIA_TYPE_VIDEO;
510 } else if (es_type == STREAM_TYPE_VIDEO_MPEG2) {
511 codec_id = AV_CODEC_ID_MPEG2VIDEO;
512 type = AVMEDIA_TYPE_VIDEO;
513 } else if (es_type == STREAM_TYPE_AUDIO_MPEG1 ||
514 es_type == STREAM_TYPE_AUDIO_MPEG2) {
515 codec_id = AV_CODEC_ID_MP3;
516 type = AVMEDIA_TYPE_AUDIO;
517 } else if (es_type == STREAM_TYPE_AUDIO_AAC) {
518 codec_id = AV_CODEC_ID_AAC;
519 type = AVMEDIA_TYPE_AUDIO;
520 } else if (es_type == STREAM_TYPE_VIDEO_MPEG4) {
521 codec_id = AV_CODEC_ID_MPEG4;
522 type = AVMEDIA_TYPE_VIDEO;
523 } else if (es_type == STREAM_TYPE_VIDEO_H264) {
524 codec_id = AV_CODEC_ID_H264;
525 type = AVMEDIA_TYPE_VIDEO;
526 } else if (es_type == STREAM_TYPE_AUDIO_AC3) {
527 codec_id = AV_CODEC_ID_AC3;
528 type = AVMEDIA_TYPE_AUDIO;
529 } else if (m->imkh_cctv && es_type == 0x91) {
530 codec_id = AV_CODEC_ID_PCM_MULAW;
531 type = AVMEDIA_TYPE_AUDIO;
532 } else if (startcode >= 0x1e0 && startcode <= 0x1ef) {
533 static const unsigned char avs_seqh[4] = { 0, 0, 1, 0xb0 };
534 unsigned char buf[8];
536 avio_read(s->pb, buf, 8);
537 avio_seek(s->pb, -8, SEEK_CUR);
538 if (!memcmp(buf, avs_seqh, 4) && (buf[6] != 0 || buf[7] != 1))
539 codec_id = AV_CODEC_ID_CAVS;
542 type = AVMEDIA_TYPE_VIDEO;
543 } else if (startcode == PRIVATE_STREAM_2) {
544 type = AVMEDIA_TYPE_DATA;
545 codec_id = AV_CODEC_ID_DVD_NAV;
546 } else if (startcode >= 0x1c0 && startcode <= 0x1df) {
547 type = AVMEDIA_TYPE_AUDIO;
549 codec_id = AV_CODEC_ID_ADPCM_ADX;
553 codec_id = AV_CODEC_ID_MP2;
555 } else if (startcode >= 0x80 && startcode <= 0x87) {
556 type = AVMEDIA_TYPE_AUDIO;
557 codec_id = AV_CODEC_ID_AC3;
558 } else if ((startcode >= 0x88 && startcode <= 0x8f) ||
559 (startcode >= 0x98 && startcode <= 0x9f)) {
560 /* 0x90 - 0x97 is reserved for SDDS in DVD specs */
561 type = AVMEDIA_TYPE_AUDIO;
562 codec_id = AV_CODEC_ID_DTS;
563 } else if (startcode >= 0xa0 && startcode <= 0xaf) {
564 type = AVMEDIA_TYPE_AUDIO;
565 if (lpcm_header_len == 6) {
566 codec_id = AV_CODEC_ID_MLP;
568 codec_id = AV_CODEC_ID_PCM_DVD;
570 } else if (startcode >= 0xb0 && startcode <= 0xbf) {
571 type = AVMEDIA_TYPE_AUDIO;
572 codec_id = AV_CODEC_ID_TRUEHD;
573 } else if (startcode >= 0xc0 && startcode <= 0xcf) {
574 /* Used for both AC-3 and E-AC-3 in EVOB files */
575 type = AVMEDIA_TYPE_AUDIO;
576 codec_id = AV_CODEC_ID_AC3;
577 } else if (startcode >= 0x20 && startcode <= 0x3f) {
578 type = AVMEDIA_TYPE_SUBTITLE;
579 codec_id = AV_CODEC_ID_DVD_SUBTITLE;
580 } else if (startcode >= 0xfd55 && startcode <= 0xfd5f) {
581 type = AVMEDIA_TYPE_VIDEO;
582 codec_id = AV_CODEC_ID_VC1;
586 avio_skip(s->pb, len);
589 /* no stream found: add a new stream */
590 st = avformat_new_stream(s, NULL);
594 st->codec->codec_type = type;
595 st->codec->codec_id = codec_id;
596 if (st->codec->codec_id == AV_CODEC_ID_PCM_MULAW) {
597 st->codec->channels = 1;
598 st->codec->channel_layout = AV_CH_LAYOUT_MONO;
599 st->codec->sample_rate = 8000;
601 st->request_probe = request_probe;
602 st->need_parsing = AVSTREAM_PARSE_FULL;
605 if (st->discard >= AVDISCARD_ALL)
607 if (startcode >= 0xa0 && startcode <= 0xaf) {
608 if (lpcm_header_len == 6 && st->codec->codec_id == AV_CODEC_ID_MLP) {
615 ret = av_get_packet(s->pb, pkt, len);
619 pkt->pos = dummy_pos;
620 pkt->stream_index = st->index;
621 av_dlog(s, "%d: pts=%0.3f dts=%0.3f size=%d\n",
622 pkt->stream_index, pkt->pts / 90000.0, pkt->dts / 90000.0,
625 return (ret < 0) ? ret : 0;
628 static int64_t mpegps_read_dts(AVFormatContext *s, int stream_index,
629 int64_t *ppos, int64_t pos_limit)
632 int64_t pos, pts, dts;
635 if (avio_seek(s->pb, pos, SEEK_SET) < 0)
636 return AV_NOPTS_VALUE;
639 len = mpegps_read_pes_header(s, &pos, &startcode, &pts, &dts);
641 av_dlog(s, "none (ret=%d)\n", len);
642 return AV_NOPTS_VALUE;
644 if (startcode == s->streams[stream_index]->id &&
645 dts != AV_NOPTS_VALUE) {
648 avio_skip(s->pb, len);
650 av_dlog(s, "pos=0x%"PRIx64" dts=0x%"PRIx64" %0.3f\n",
651 pos, dts, dts / 90000.0);
656 AVInputFormat ff_mpegps_demuxer = {
658 .long_name = NULL_IF_CONFIG_SMALL("MPEG-PS (MPEG-2 Program Stream)"),
659 .priv_data_size = sizeof(MpegDemuxContext),
660 .read_probe = mpegps_probe,
661 .read_header = mpegps_read_header,
662 .read_packet = mpegps_read_packet,
663 .read_timestamp = mpegps_read_dts,
664 .flags = AVFMT_SHOW_IDS | AVFMT_TS_DISCONT,
667 #if CONFIG_VOBSUB_DEMUXER
669 #define REF_STRING "# VobSub index file,"
670 #define MAX_LINE_SIZE 2048
672 static int vobsub_probe(AVProbeData *p)
674 if (!strncmp(p->buf, REF_STRING, sizeof(REF_STRING) - 1))
675 return AVPROBE_SCORE_MAX;
679 static int vobsub_read_header(AVFormatContext *s)
681 int i, ret = 0, header_parsed = 0, langidx = 0;
682 MpegDemuxContext *vobsub = s->priv_data;
683 char *sub_name = NULL;
685 char *ext, *header_str;
691 char alt[MAX_LINE_SIZE] = {0};
692 AVInputFormat *iformat;
694 sub_name = av_strdup(s->filename);
695 fname_len = strlen(sub_name);
696 ext = sub_name - 3 + fname_len;
697 if (fname_len < 4 || *(ext - 1) != '.') {
698 av_log(s, AV_LOG_ERROR, "The input index filename is too short "
699 "to guess the associated .SUB file\n");
700 ret = AVERROR_INVALIDDATA;
703 memcpy(ext, !strncmp(ext, "IDX", 3) ? "SUB" : "sub", 3);
704 av_log(s, AV_LOG_VERBOSE, "IDX/SUB: %s -> %s\n", s->filename, sub_name);
706 if (!(iformat = av_find_input_format("mpeg"))) {
707 ret = AVERROR_DEMUXER_NOT_FOUND;
711 vobsub->sub_ctx = avformat_alloc_context();
712 if (!vobsub->sub_ctx) {
713 ret = AVERROR(ENOMEM);
717 if ((ret = ff_copy_whitelists(vobsub->sub_ctx, s)) < 0)
720 ret = avformat_open_input(&vobsub->sub_ctx, sub_name, iformat, NULL);
722 av_log(s, AV_LOG_ERROR, "Unable to open %s as MPEG subtitles\n", sub_name);
726 av_bprint_init(&header, 0, AV_BPRINT_SIZE_UNLIMITED);
727 while (!avio_feof(s->pb)) {
728 char line[MAX_LINE_SIZE];
729 int len = ff_get_line(s->pb, line, sizeof(line));
734 line[strcspn(line, "\r\n")] = 0;
736 if (!strncmp(line, "id:", 3)) {
737 if (sscanf(line, "id: %63[^,], index: %u", id, &stream_id) != 2) {
738 av_log(s, AV_LOG_WARNING, "Unable to parse index line '%s', "
739 "assuming 'id: und, index: 0'\n", line);
744 if (stream_id >= FF_ARRAY_ELEMS(vobsub->q)) {
745 av_log(s, AV_LOG_ERROR, "Maximum number of subtitles streams reached\n");
746 ret = AVERROR(EINVAL);
752 /* We do not create the stream immediately to avoid adding empty
753 * streams. See the following timestamp entry. */
755 av_log(s, AV_LOG_DEBUG, "IDX stream[%d] id=%s\n", stream_id, id);
757 } else if (!strncmp(line, "timestamp:", 10)) {
760 int64_t pos, timestamp;
761 const char *p = line + 10;
763 if (stream_id == -1) {
764 av_log(s, AV_LOG_ERROR, "Timestamp declared before any stream\n");
765 ret = AVERROR_INVALIDDATA;
769 if (!st || st->id != stream_id) {
770 st = avformat_new_stream(s, NULL);
772 ret = AVERROR(ENOMEM);
776 st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
777 st->codec->codec_id = AV_CODEC_ID_DVD_SUBTITLE;
778 avpriv_set_pts_info(st, 64, 1, 1000);
779 av_dict_set(&st->metadata, "language", id, 0);
781 av_dict_set(&st->metadata, "title", alt, 0);
784 if (sscanf(p, "%02d:%02d:%02d:%03d, filepos: %"SCNx64,
785 &hh, &mm, &ss, &ms, &pos) != 5) {
786 av_log(s, AV_LOG_ERROR, "Unable to parse timestamp line '%s', "
787 "abort parsing\n", line);
788 ret = AVERROR_INVALIDDATA;
791 timestamp = (hh*3600LL + mm*60LL + ss) * 1000LL + ms + delay;
792 timestamp = av_rescale_q(timestamp, av_make_q(1, 1000), st->time_base);
794 sub = ff_subtitles_queue_insert(&vobsub->q[s->nb_streams - 1], "", 0, 0);
796 ret = AVERROR(ENOMEM);
800 sub->pts = timestamp;
801 sub->stream_index = s->nb_streams - 1;
803 } else if (!strncmp(line, "alt:", 4)) {
804 const char *p = line + 4;
808 av_log(s, AV_LOG_DEBUG, "IDX stream[%d] name=%s\n", stream_id, p);
809 av_strlcpy(alt, p, sizeof(alt));
812 } else if (!strncmp(line, "delay:", 6)) {
813 int sign = 1, hh = 0, mm = 0, ss = 0, ms = 0;
814 const char *p = line + 6;
818 if (*p == '-' || *p == '+') {
819 sign = *p == '-' ? -1 : 1;
822 sscanf(p, "%d:%d:%d:%d", &hh, &mm, &ss, &ms);
823 delay = ((hh*3600LL + mm*60LL + ss) * 1000LL + ms) * sign;
825 } else if (!strncmp(line, "langidx:", 8)) {
826 const char *p = line + 8;
828 if (sscanf(p, "%d", &langidx) != 1)
829 av_log(s, AV_LOG_ERROR, "Invalid langidx specified\n");
831 } else if (!header_parsed) {
832 if (line[0] && line[0] != '#')
833 av_bprintf(&header, "%s\n", line);
837 if (langidx < s->nb_streams)
838 s->streams[langidx]->disposition |= AV_DISPOSITION_DEFAULT;
840 for (i = 0; i < s->nb_streams; i++) {
841 vobsub->q[i].sort = SUB_SORT_POS_TS;
842 ff_subtitles_queue_finalize(&vobsub->q[i]);
845 if (!av_bprint_is_complete(&header)) {
846 av_bprint_finalize(&header, NULL);
847 ret = AVERROR(ENOMEM);
850 av_bprint_finalize(&header, &header_str);
851 for (i = 0; i < s->nb_streams; i++) {
852 AVStream *sub_st = s->streams[i];
853 sub_st->codec->extradata = av_strdup(header_str);
854 sub_st->codec->extradata_size = header.len;
863 static int vobsub_read_packet(AVFormatContext *s, AVPacket *pkt)
865 MpegDemuxContext *vobsub = s->priv_data;
866 FFDemuxSubtitlesQueue *q;
867 AVIOContext *pb = vobsub->sub_ctx->pb;
868 int ret, psize, total_read = 0, i;
871 int64_t min_ts = INT64_MAX;
873 for (i = 0; i < s->nb_streams; i++) {
874 FFDemuxSubtitlesQueue *tmpq = &vobsub->q[i];
876 av_assert0(tmpq->nb_subs);
877 ts = tmpq->subs[tmpq->current_sub_idx].pts;
884 ret = ff_subtitles_queue_read_packet(q, &idx_pkt);
888 /* compute maximum packet size using the next packet position. This is
889 * useful when the len in the header is non-sense */
890 if (q->current_sub_idx < q->nb_subs) {
891 psize = q->subs[q->current_sub_idx].pos - idx_pkt.pos;
893 int64_t fsize = avio_size(pb);
894 psize = fsize < 0 ? 0xffff : fsize - idx_pkt.pos;
897 avio_seek(pb, idx_pkt.pos, SEEK_SET);
904 int n, to_read, startcode;
906 int64_t old_pos = avio_tell(pb), new_pos;
909 ret = mpegps_read_pes_header(vobsub->sub_ctx, NULL, &startcode, &pts, &dts);
911 if (pkt->size) // raise packet even if incomplete
915 to_read = ret & 0xffff;
916 new_pos = avio_tell(pb);
917 pkt_size = ret + (new_pos - old_pos);
919 /* this prevents reads above the current packet */
920 if (total_read + pkt_size > psize)
922 total_read += pkt_size;
924 /* the current chunk doesn't match the stream index (unlikely) */
925 if ((startcode & 0x1f) != idx_pkt.stream_index)
928 ret = av_grow_packet(pkt, to_read);
932 n = avio_read(pb, pkt->data + (pkt->size - to_read), to_read);
934 pkt->size -= to_read - n;
935 } while (total_read < psize);
937 pkt->pts = pkt->dts = idx_pkt.pts;
938 pkt->pos = idx_pkt.pos;
939 pkt->stream_index = idx_pkt.stream_index;
941 av_free_packet(&idx_pkt);
946 av_free_packet(&idx_pkt);
950 static int vobsub_read_seek(AVFormatContext *s, int stream_index,
951 int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
953 MpegDemuxContext *vobsub = s->priv_data;
955 /* Rescale requested timestamps based on the first stream (timebase is the
956 * same for all subtitles stream within a .idx/.sub). Rescaling is done just
957 * like in avformat_seek_file(). */
958 if (stream_index == -1 && s->nb_streams != 1) {
960 AVRational time_base = s->streams[0]->time_base;
961 ts = av_rescale_q(ts, AV_TIME_BASE_Q, time_base);
962 min_ts = av_rescale_rnd(min_ts, time_base.den,
963 time_base.num * (int64_t)AV_TIME_BASE,
964 AV_ROUND_UP | AV_ROUND_PASS_MINMAX);
965 max_ts = av_rescale_rnd(max_ts, time_base.den,
966 time_base.num * (int64_t)AV_TIME_BASE,
967 AV_ROUND_DOWN | AV_ROUND_PASS_MINMAX);
968 for (i = 0; i < s->nb_streams; i++) {
969 int r = ff_subtitles_queue_seek(&vobsub->q[i], s, stream_index,
970 min_ts, ts, max_ts, flags);
977 if (stream_index == -1) // only 1 stream
979 return ff_subtitles_queue_seek(&vobsub->q[stream_index], s, stream_index,
980 min_ts, ts, max_ts, flags);
983 static int vobsub_read_close(AVFormatContext *s)
986 MpegDemuxContext *vobsub = s->priv_data;
988 for (i = 0; i < s->nb_streams; i++)
989 ff_subtitles_queue_clean(&vobsub->q[i]);
991 avformat_close_input(&vobsub->sub_ctx);
995 AVInputFormat ff_vobsub_demuxer = {
997 .long_name = NULL_IF_CONFIG_SMALL("VobSub subtitle format"),
998 .priv_data_size = sizeof(MpegDemuxContext),
999 .read_probe = vobsub_probe,
1000 .read_header = vobsub_read_header,
1001 .read_packet = vobsub_read_packet,
1002 .read_seek2 = vobsub_read_seek,
1003 .read_close = vobsub_read_close,
1004 .flags = AVFMT_SHOW_IDS,
1005 .extensions = "idx",